





GIA Gübelin(古柏林)宝石项目:各种宝石(钠柱晶石 — 钠沸石)
Among the collection assembled by Dr. Edward Gübelin are a number of uncommon gemstones from many worldwide localities.

深入探寻 2013 年图森展


锂紫玉的历史与知识
Kunzite is a relative newcomer to the array of colored stones available for use in jewelry.

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